Sarah Walters

By GREGORY ZELLER // The countdown is on to what is arguably Long Island’s most entertaining annual charity event, and undeniably its most pugilistic. More than 300 friends, family members, sponsors, fans and well-wishers turned out Oct. 22 at the Mansion at Oyster Bay for the “Boxer Matchup” portion of the 16th annual Long Island Fight for Charity – and eyes now turn to fight night, scheduled for Nov. 25 at the Hilton Long Island…